KR101948860B1 - Eco-Friendly Cars Ceiling With A Polyester Foam Sheet - Google Patents

Abstract

The present invention relates to an automotive ceiling material comprising a polyester foam sheet as a core layer and a polyester nonwoven fabric as a skin layer on both sides of the core layer, wherein the core layer and the skin layer are coated with a polyester- The present invention relates to a ceiling material for an environmentally-friendly automobile.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-friendly vehicle ceiling with a polyester foam sheet,

The present invention relates to a ceiling material for an environmentally friendly automobile which can be recycled, and more particularly, to a durable material which is excellent in durability composed of a skin layer of a polyester foam sheet, a polyester adhesive material and a polyester nonwoven fabric sheet, And a ceiling material for an environmentally friendly automobile having excellent VOCs reduction effect.

The ceiling material for automobiles is attached to the ceiling part of the automobile so as to block the noise from the outside and improve the heat insulation of the automobile. Polypropylene, polyethylene, polyamide, polyester, etc., which are thermoplastic organic fibers as a ceiling material in general, are generally limited in their use due to their low glass transition temperature and heat resistance. Therefore, glass fiber, thermosetting resin and the like The above-mentioned disadvantages are overcome by the method of addition.

As a conventional type of ceiling material for automobiles, there is a combination of a polyurethane foam and a glass mat composed of glass fiber. In the case of a polyurethane foam, sound absorption is good but weather resistance is bad, There is a problem that durability is low due to occurrence of sagging, environmental problems due to the use of glass fiber, and recycling is difficult because it is not the same series material. In addition, when the EVA (Ethylene Vinyl Acetate) hot melt film is applied in the lamination of the respective materials, the interfacial adhesion with the polyester substrate is deteriorated and the problem of the emission of the volatile organic compounds (VOCs) have.

As a ceiling material for automobiles, Korean Patent Registration No. 10-1345644 discloses a technique of utilizing a polyester spun lace without using a hot melt film as a means for bonding a base material and a skin. However, although EVA-based hot melt films are not used, EVA-based hot melt films are used to reduce VOCs. However, since the weather resistance of polyurethane foam is poor, durability such as discoloration and foaming of foam cells occur have.

Also, Korean Patent Registration No. 10-1371848 discloses a technique of utilizing a high heat-resistant polyurethane foam by mixing a thermoplastic resin powder, calcium carbonate and aluminum short fibers into a foamable polyurethane raw material. However, although the heat resistance can be enhanced by using the high heat-resistant polyurethane foam in the above-described manner, there is a problem that recycling is difficult because the materials constituting each layer of the ceiling material are different.

Therefore, in order to solve the above problems, a polyester nonwoven fabric sheet is used as a polyester foam sheet and a polyester adhesive material, and a skin layer is used to provide an eco-friendly, durable, recyclable, VOCs- It is necessary to develop ceiling material for automobile.

 In order to solve the above-described problems, the present invention provides an eco-friendly automotive ceiling material having excellent durability, recyclability and excellent VOCs reduction effect by using a polyester foam sheet and a polyester adhesive material and a nonwoven fabric sheet .

In order to achieve the above object, the present invention provides an automotive ceiling material comprising a polyester foam sheet as a core layer and a polyester nonwoven fabric as a skin layer on both side surfaces of the core layer, wherein the core layer and the skin layer are made of polyester (EN) A ceiling material for an environment - friendly automobile, which is composed of an adhesive bonding film or an adhesive layer which can be adhered using an adhesive web.

The present invention also provides a recyclable ceiling material for an environmentally friendly automobile, wherein the polyester foam sheet has a density of 30 to 150 kg / m ³ and a thickness of 3 to 12 mm.

Further, the adhesive film or adhesive web of the present invention is constituted as a polyester copolymer composition, wherein the polyester copolymer composition is obtained by esterifying a diol (diol) as a hard segment raw material with a dicarbonic acid, (1,4-BD) or 1,4-butanediol (1,4-BD) and 2-methyl 1, 4-butanediol Propanediol (MPO) mixture, and the dicarbonic acid may be any one selected from the group consisting of dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI), or an anhydride and an anhydride resin, and the polyol may be composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol (PPG) Characteristic It provides a ceiling for eco-friendly vehicles that recyclable.

Further, the adhesive film or adhesive web of the present invention is constituted as a polyester copolymer composition, wherein the polyester copolymer composition is obtained by esterifying a diol (diol) as a hard segment raw material with a dicarbonic acid, The diol may be a mixture of ethylene glycol (EG), ethylene glycol (EG) and 2-methyl-1,3-propanediol (MPO) The dicarbonic acid may be composed of terephthalic acid (TPA) or a mixture of terephthalic acid (TPA) and anhydride resin. The polyol may be poly (tetramethylene ether) glycol (PTMG) , Polyethylene glycol (PEG), and polypropylene glycol (PPG). The present invention also provides a reclaimable ceiling material for an environmentally friendly automobile.

The present invention also relates to an anhydride resin, wherein the anhydride resin is selected from the group consisting of methyltetrahydrophthalic anhydride (MeTHPA), methylhexahydrophthalic anhydride (MeHHPA), terahydophthalic anhydride (THPA) And a ropthalic anhydride (HHPA).

The present invention also relates to a process for preparing the conjugated diene-conjugated diene-anhydride resin by reacting a conjugated diene having two double bonds with a maleic anhydride in a Diels-Alder reaction Which is characterized by comprising a product according to the invention.

Also, the present invention provides a built-in automotive vehicle comprising 10 to 70% by weight of the polyol, and 30 to 90% by weight of a diol and a dicarbonic acid.

Further, the present invention provides a recycled ceiling material for an environmentally-friendly automobile, wherein the polyester copolymerized adhesive film has a thickness of 10 to 100 탆 and an adhesive strength to the polyester nonwoven fabric of 3 kgf / in or more.

The polyester copolymerized adhesive web of the present invention preferably has a fineness of 1 to 5 dpf (denier per filament), a weight of 10 to 100 g / m ² , and an adhesive strength to a polyester nonwoven fabric of 2.5 kgf / Provides ceiling material for eco-friendly automobiles as possible.

Also, the present invention provides a ceiling material for an automobile for recycling, wherein the automotive ceiling material has a flexural strength of 20 N or more, VOCs of 36 ppm or less, and an air permeability of 1.5 mm / s or more.

The present invention also provides a vehicle interior material comprising a polyester foam sheet.

INDUSTRIAL APPLICABILITY The present invention uses a polyester foam sheet as a core layer of an automotive ceiling to provide excellent durability and heat resistance, eliminates the need to use a glass mat using glass fiber, and is recyclable and environmentally friendly.

In addition, the present invention is an adhesive material for bonding a core layer and a skin layer, and has a characteristic of being excellent in adhesive force, excellent in VOCs reduction effect and being recyclable by using a 100% polyester copolymerization adhesive film or an adhesive web.

1 is a sectional view of a recycling-use ceiling material for an environment-friendly automobile according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms "substantially", "substantially", and the like are used herein to refer to a value in or near the numerical value when presenting manufacturing and material tolerances inherent in the meanings mentioned, Absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

1 is a sectional view of a ceiling material 1 for an environmentally friendly automobile which is recyclable according to the present invention.

A polyester foam sheet is used as a core layer 30 of an automotive ceiling material and a core layer 30 and a polyester nonwoven skin layer 10 ) Which is excellent in durability, is recyclable, and has an excellent effect of reducing VOCs by using a polyester copolymerized adhesive film or an adhesive web.

First, the polyester foam sheet used as the core layer 30 of the present invention is produced by dissolving a polyester polymer material in an extruder, extruding the foamed polyester material, and introducing carbon dioxide into the foam sheet to produce a foam sheet. The foam sheet has a density of 30 to 150 kg / m ³ and a thickness of 3 to 12 mm. When the density of the foam sheet is 30 kg / m ³ or less, there is a problem that the cells foamed in the molding process are destroyed. When the density is 150 kg / m ³ or more, the automotive ceiling material becomes too heavy.

Further, when the thickness of the polyester foam sheet is 3 mm or less, there is a problem that the bending strength after molding is lowered, and when the thickness is 12 mm or more, the weight of the ceiling material for automobiles becomes heavy.

It is also possible to use an adhesive film or an adhesive web composed of a polyester copolymer composition as the material of the adhesive layer 20 for bonding the core layer 30 of the ceiling material 1 and the skin layer 10 to the EVA- The adhesion between the skin layer and the core layer is excellent and the VOCs reduction effect is excellent.

The polyester-cohesive adhesive film can be produced by using a thermoplastic copolymer polyester polymer by using a T-die or an air-blown apparatus, and has a thickness of 10 to 100 μm, The adhesive strength is more than 3kgf / in.

If the thickness of the adhesive film is less than 10 mu m, the film manufacturing process is difficult, and the adhesive force between the skin layer and the core layer of the automobile ceiling member is deteriorated. When the thickness is more than 100 mu m, the sound absorbing effect of the automobile ceiling member is lowered, .

The polyester-copolymerized adhesive web can be produced by a method in which a thermoplastic polyester copolymerized polymer can be produced by using a spunbonding facility and a fineness heat-bonded web, and having a fineness of 1 to 5 dpf (denier per filament) and a weight of 10 to 100 g / m < ² >, and an adhesive strength to a polyester nonwoven fabric of 2.5 kgf / in or more.

As for the thermoplastic copolymer polyester polymer composition used for the adhesive layer 20,

The copolymerized polyester polymer may be prepared by esterification of a diol and a dicarbonic acid and condensation polymerization of a polyol in the reaction product. The esterification reaction may be carried out by two methods. Dimethyl Bis-hydroxyethyl terephthalate (TPA) by a transesterification method (DMT method) by reaction of terephthalate (DMT) with ethylene glycol (EG) or a direct esterification method (TPA method) by reaction of terephthalic acid and ethylene glycol BHET) and BHET are synthesized, and the molecular chain is increased in length by melting and condensation polymerization while removing ethylene glycol (EG).

The ester exchange method (DMT method) is a method in which the diol is 1,4-butanediol (1,4-BD) or 1,4-butanediol (1,4-BD) MPO) mixture,

The dicarbonic acid may be any one of dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI), or may be composed of an anhydride resin mixture in any one of the above compositions,

The polyol may be a polyester elastomeric adhesive resin composition which may be composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol (PPG).

Although an anhydride resin in the above dicarbonic acid can be directly used as a starting material for the esterification reaction, it is also possible to use a conjugated diene having two double bonds and a maleic anhydride The product through a Diels-Alder reaction of maleic anhydride may also be used.

First, to describe the esterification reaction, a low molecular weight diol component of 1,4-butanediol (1,4-BD) butylene glycol is esterified with dimethyl terephthalate (DMT) to form a hard segment.

The molar fraction of dicarbonic acid and diol is 1: 1.0 ~ 1.8, and the excess diol component is mostly recovered during the condensation polymerization process. (Dicarbonic acid) and Diol (Diol) have a value of 30 to 99% by weight in the whole elastic adhesive resin composition.

The mixture of 1,4-butanediol (1,4-BD) and 2-methyl 1,3-propanediol (MPO) is prepared by mixing 70 to 95 mol% of 1,4- To 30 mol% of 2-methyl-1,3-propanediol (MPO) can be used. When a certain amount of 2-methyl-1,3-propanediol (MPO) is added, the tendency of the hardness of the polyester elastic adhesive resin is lowered, and the property to restore the original state is increased.

Also, the dimethyl terephthalate (DMT) and the anhydride resin mixture may be composed of 40 to 99 mol% of dimethyl terephthalate (DMT) and 1 to 60 mol% of an anhydride resin .

In addition, the anhydride resin may have a molar ratio of methylterahydrophthalic anhydride (MeTHPA) and methylhexahydrophthalic anhydride (MeHHPA) of 0.5 to 9.5 to 9.5 to 0.5.

Conventionally, aromatic or aliphatic tricarboxylic acids such as isophthalic acid, adipic acid and succinic acid have been used as a copolymerization raw material in order to control the melting point of the polyester elastic adhesive resin without using only dimethyl terephthalate (DMT)

 In the present invention, an anhydride resin such as methyltetrahydrophthalic anhydride (MeTHPA), methylhexahydrophthalic anhydride (MeHHPA), terahydrophthalic anhydride (THPA), and hexahydrophthalic When using at least one of the anhydride (HHPA) and the terephthalate (DMT), it is possible to easily maintain the elasticity and physical properties, which are important characteristics of the present invention, It has the advantage of being able to control.

Even when only a small amount of methyltetrahydrophthalic anhydride (MeTHPA) is substantially added, a melting point lowering phenomenon occurs, and a drop of about 4 ° C per mole can be obtained. Methyltetrahydrophthalic anhydride (MeTHPA), methyl When hexahydrophthalic anhydride (MeHHPA) is used in a molar ratio of 4 to 6 to 6 to 4, the phenomenon of lowering the melting point of the patent occurs more greatly.

 For example, when mixed with MeTHPA alone, a decrease of about 5 ° C per 1 mole of the mixture results in a greater effect of lowering the melting point.

The catalyst used in the esterification reaction is selected from the group consisting of zinc acetate, sodium acetate, magnesium acetate, tetranomalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silicon oxide microcopolymer, and nano titanate And is used in the range of 15000 ppm with respect to 100 parts by weight of the polyester based elastic adhesive resin. If the amount of the catalyst is insufficient, the esterification reaction rate is slowed and the thermal stability of the polyester based elastic adhesive resin is deteriorated .

After the esterification reaction, the condensation polymerization proceeds.

The oligomer solution obtained by the esterification reaction and the soft segment polyol were introduced into a pressure resistance and heat resistance reactor capable of undergoing vacuum decompression together with a condensation polymerization catalyst, a heat stabilizer and a photo stabilizer, and then a pressure of 760 to 1000 Torr and a pressure of 200 After an excessive amount of diol (Doil) is distilled off at a temperature of ~ 270 ° C, condensation polymerization is completed under a high vacuum of 1 mmHg or less to obtain a polyester elastomeric bonding resin of the present invention.

Here, the polyol may be selected from poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) or polypropylene glycol (PPG) % By weight can be used.

The polymerization catalyst used in the condensation polymerization step may be one selected from the group consisting of antimony trioxide, antimony acetate, tetranormalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silica oxide microcopolymer, and nano titanate And can be used in the range of 15000 ppm based on 100 parts by weight of the polyester elastic bonding resin.

As another method, the ester exchange method (TPA method)

(TPA method) and polycondensation of the reaction product, and the reaction product of the diol and the dicarbonic acid as the raw material of the hard segment and the polyol as the raw material of the soft segment are esterified (TPA method)

More specifically, the diol may be composed of a mixture of ethylene glycol (EG) or ethylene glycol (EG) and 2-methyl 1,3-propanediol (MPO)

The dicarbonic acid may be composed of a mixture of terephthalic acid (TPA), terephthalic acid (TPA) and anhydride resin,

The anhydride resin may also be selected from the group consisting of methyl tetrahydrophthalic anhydride (MeTHPA), methylhexahydrophthalic anhydride (MeHHPA), terahydrophthalic anhydride (THPA), and hexahydrophthalic anhydride And hydride (HHPA) may be added.

The polyol may be composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG), and polypropylene glycol (PPG).

Although an anhydride resin in the above dicarbonic acid can be directly used as a starting material for the esterification reaction, it is also possible to use a conjugated diene having two double bonds and a maleic anhydride The product through a Diels-Alder reaction of maleic anhydride may also be used.

First, a description will be given of the esterification reaction of the polyester composition of the present invention. The esterification reaction will be described below. A low molecular weight diol component Dicarbonic acid is esterified.

The molar fraction of dicarbonic acid and diol is 1: 1.0 ~ 1.8, and the excess diol component is mostly recovered during the condensation polymerization process. (Dicarbonic acid) and Diol (Diol) have a value of 30 to 99% by weight in the entire polyester elastic adhesive resin composition.

The mixture of ethylene glycol (EG) and 2-methyl-1,3-propanediol (MPO) in the diol component may contain 1 to 99 mol% of ethylene glycol (EG) and 99 to 1 mol% of 2-methyl 1,3-propanediol (MPO) can be used. When a certain amount of 2-methyl-1,3-propanediol (MPO) is added, the tendency of the hardness of the polyester elastic adhesive resin is lowered, and the property to restore the original state is increased.

Also, the dimethyl terephthalate (DMT) and the anhydride resin mixture may be composed of 40 to 99 mol% of dimethyl terephthalate (DMT) and 1 to 60 mol% of an anhydride resin .

In addition, the anhydride resin may have a molar ratio of methyl tertahydrophthalic anhydride (MeTHPA) and methyl hexahydrophthalic anhydride (MeHHPA) of 4 to 6 to 6 to 4.

Conventionally, aromatic or aliphatic tricarboxylic acids such as isophthalic acid, adipic acid and succinic acid have been used as a copolymerization raw material in order to control the melting point of polyester elastic adhesive resin without using only terephthalic acid (TPA)

In the present invention, an anhydride resin such as methyltetrahydrophthalic anhydride (MeTHPA), methylhexahydrophthalic anhydride (MeHHPA), terahydrophthalic anhydride (THPA), and hexahydrophthalic When TPA is added to any one or more of the anhydride (HHPA), it is possible to easily control various melting points required in the molding process of the final product while maintaining elasticity and physical properties, which are important characteristics of the present invention .

Even when only a small amount of methyltetrahydrophthalic anhydride (MeTHPA) is substantially introduced, a melting point lowering phenomenon occurs and a drop of about 4 per mole can be obtained, and methyltetrahydrophthalic anhydride (MeTHPA) When the molar ratio of 4 to 6 to 6 to 4 is mixed with the hydrophthalic anhydride (MeHHPA), the melting point is lowered more.

 For example, in case of using mixed anthrahydride (MeTHPA) alone, a drop effect of about 5 per 1 mole of the mixture is obtained, and the effect of lowering the melting point is larger.

The catalyst used in the esterification reaction is selected from the group consisting of zinc acetate, sodium acetate, magnesium acetate, tetranomalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silicon oxide microcopolymer, and nano titanate And is used in the range of 15000 ppm with respect to 100 parts by weight of the polyester based elastic adhesive resin. If the amount of the catalyst is insufficient, the esterification reaction rate is slowed and the thermal stability of the polyester based elastic adhesive resin is deteriorated .

After the esterification reaction, the condensation polymerization proceeds.

The oligomer solution obtained by the esterification reaction and the soft segment polyol were introduced into a pressure resistance and heat resistance reactor capable of undergoing vacuum decompression together with a condensation polymerization catalyst, a heat stabilizer and a photo stabilizer, and then a pressure of 760 to 1000 Torr and a pressure of 200 An excessive amount of diol (Doil) is distilled at a temperature of ~ 270 ° C., and condensation polymerization is carried out under a high vacuum of 1 mmHg or less to obtain a polyester elastic bonding resin of the present invention.

Here, the polyol may be selected from poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) or polypropylene glycol (PPG) % By weight can be used.

The polymerization catalyst used in the condensation polymerization step may be one selected from the group consisting of antimony trioxide, antimony acetate, tetranormalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silica oxide microcopolymer, and nano titanate And can be used in the range of 15000 ppm based on 100 parts by weight of the polyester elastic bonding resin.

The process for producing a recyclable eco-friendly automotive ceiling material according to the present invention is a process for producing a polyester foam sheet, which comprises laminating a 100% polyester copolymer adhesive film or an adhesive web on both sides of a foam sheet, After the nonwoven fabric sheets are laminated, they are preheated before cold forming and then cold formed.

In the present invention, a ceiling material for automobiles is excellent in durability and heat resistance by using a polyester foam sheet as a core layer of an automotive ceiling material, and it is not necessary to use a glass mat using glass fiber, have.

In the present invention, 100% polyester copolymerized adhesive film or adhesive web (Web) is used as the material of the adhesive layer for bonding the core layer 30 and the skin layer 10, and the adhesive strength is excellent and the effect of reducing VOCs is excellent And can be recycled.

The features and other advantages of the present invention as described above will become more apparent from the following examples, which should not be construed as limiting or limiting the scope of protection of the present invention, .

Example  One

The core sheet was melted in an extruder and extruded, and carbon dioxide was injected into it to form a foamed polyester foam sheet. The foam sheet used had a density of 60 kg / m ³ and a thickness of 7 mm. A 100% polyester copolymer adhesive film was used as an adhesive layer for bonding the core layer and the skin layer, and the thickness of the adhesive film used was 20 μm. The weight of the polyester nonwoven fabric used as the skin layer was 40 g / m ² .

And then laminating an adhesive film on both sides of the polyester foam sheet was then laminated to a polyester non-woven fabric on the adhesive film 200 ℃ in the heat chamber * 1 minute warm-up using the press subjected to cold forming to 5kgf / cm ² pressure car Was prepared.

Example  2

An automotive ceiling material was prepared in the same manner as in Example 1, except that a 100% polyester copolymerized adhesive web was used as the adhesive layer.

Comparative Example  One

A polyurethane foam was used as the core layer, and the foam used was a density of 60 kg / m ³ and a thickness of 7 mm. An EVA-based hot-melt film was used as an adhesive layer for bonding the core layer and the skin layer, and the thickness of the hot-melt film used was 60 μm. The weight of the polyester nonwoven fabric used as the skin layer was 40 g / m ² .

By laminating the EVA-based hot-melt film on both surfaces of the polyurethane foam was subjected to cold forming to 5kgf / cm ² pressure using a press was then laminated to a polyester non-woven fabric onto a hot-melt film column 200 ℃ in the chamber * 1 minute warm-up A ceiling material for automobiles was manufactured.

Comparative Example  2

A polyester foam sheet was used as a core layer, and a ceiling material for a vehicle was manufactured in the same manner as in Example 1, except that the used foam sheet had a density of 20 kg / m ³ and a thickness of 7 mm.

Comparative Example  3

A polyester foam sheet was used as a core layer, and a ceiling material for a vehicle was manufactured in the same manner as in Example 1, except that the used foam sheet had a density of 200 kg / m ³ and a thickness of 5 mm.

◎ Flexural strength, flexural modulus

  - Analyzed by the method specified in ASTM D638. However, the size of the test piece was 50 x 150 mm, the span length was 100 mm, and the test speed was 5 mm / min.

◎ Heat cycle (Cycle)

   - < / RTI > MS 383-04.

   - Good: No peeling, swelling, deflection, deformation and no discernible discoloration

   - Defective: peeling, swelling, sagging, discoloration occurs.

◎ Adhesion

A sample having the adhesive layer adhered to the polyester nonwoven fabric was cut to a width of 1 inch and the tensile strength was measured according to the measurement method of ASTM D882 (Tensile Testing of Thin Plastic Sheet) to evaluate the adhesive strength.

◎ VoCs

   - VOCs emissions: MS 300-55, and the analysis was carried out by precision analysis method (Bag test method).

◎ Air permeability

   - Air permeability was evaluated according to KS K ISO 9237: 2011 measurement method.

               division       Example        Comparative Example     One    2     One    2 3





Configuration







Core charge
(Foam)


Material
 Polyester foam sheet Polyester foam sheet Polyurethane foam
Sheet Polyester foam sheet Polyester foam sheet density Kg / m ³ 60 60 60 20 200 thickness mm 7 7 7 7 5
Adhesive layer
shape Film or Web film Web film film film Material
Polyester copolymer film Polyester copolymerized web EVA hot melt Polyester copolymer film Polyester copolymer film Thickness or weight 탆 or g / m ³ 20 20 60 20 20 Skin layer (nonwoven fabric)
Material Polyester Polyester Polyester Polyester Polyester weight g / m ³ 40 40 40 40 40

Properties


Flexural strength N 22 22 15 13 28 Flexural modulus Mpa 58 57 48 26 87 Heat Cycle 3rd time Good Good Bad Bad Good Adhesion (adhesive layer-skin layer) Kgh / in 3.5 3.1 1.3 3.5 3.5 VOCS ppm 36 or less 36 or less 420 or more 36 or less 36 or less Air permeability mm / s 1.5 3.8 0.6 1.8 1.2

The results shown in Table 1 show that, in Examples 1 and 2, which are ceiling materials for automobiles to which a polyester foam sheet is applied in comparison with Comparative Example 1, which is a ceiling material for automobiles to which polyurethane products of the same density and weight are applied, 20 N or more, an air permeability of 1.5 mm / s or more, a good heat resistance, and an adhesive strength of 3.0 Kgh / in or more.

In addition, it can be seen that the use of a 100% polyester copolymerized adhesive film or a web is superior to the EVA-based hot-melt film as the adhesive layer, and the VOCs reduction effect is excellent.

In Comparative Example 2, when the density of the foam sheet is 30 kg / m < ³ > or less as compared with Example 1, the foamed cells may be broken in the molding process, and the heat cycle is poor.

In Comparative Example 3, the density of the foam sheet is 150 kg / m ³ or more as compared with Example 1, and the weight of the ceiling material may be a problem, and the air permeability is less than 1.5 mm / s.

Also, it can be seen that the air permeability of Example 2 in which the web is applied to the film as the adhesive layer is superior.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1: ceiling material 10: skin layer
20: adhesive layer 30: core layer

Claims (11)

As ceiling materials for environmentally friendly vehicles,
A polyester foam sheet is used as a core layer, polyester nonwoven fabric is used as a skin layer on both side surfaces of the core layer,
Wherein the core layer and the skin layer are composed of an adhesive layer which is bonded using a polyester copolymerization adhesive film or an adhesive web,
The polyester foam sheet has a density of 30 to 60 kg / m ³ , a thickness of 3 to 12 mm,
The adhesive film or adhesive web is configured as a polyester copolymer composition,
The polyester copolymer composition is prepared by esterifying a diol and a dicarbonic acid as a raw material of a hard segment and polycondensation of a polyol as a soft segment raw material,
The diol may be 1,4-butanediol (1,4-BD)
1,4-butanediol (1,4-BD) and 2-methyl 1,3-propanediol (MPO)
The dicarbonic acid may be one selected from the group consisting of dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI), or a mixture of any one of the above-mentioned compositions with an anhydride resin,
The polyol is composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol (PPG)
The polyester-cohesive adhesive film has a thickness of 10 to 100 탆, an adhesive strength to the polyester nonwoven fabric of 3 kgf / in or more,
Wherein the polyester copolymerized adhesive web has a fineness of 1 to 5 dpf (denier per filament), a weight of 10 to 100 g / m ² , an adhesive strength of 2.5 kgf / in or more to a polyester nonwoven fabric,
Wherein the automotive ceiling material has a flexural strength of 20 N or more, VOCs of 36 ppm or less, and an air permeability of 1.5 mm / s or more.


delete delete delete The method according to claim 1,
The anhydride resin may be selected from the group consisting of methyl tetrahydrophthalic anhydride (MeTHPA), methylhexahydrophthalic anhydride (MeHHPA), terahydrophthalic anhydride (THPA) and hexahydrophthalic anhydride (HHPA). ≪ / RTI >
The method according to claim 1,
The anhydride resin includes a product obtained by a Diels-Alder reaction of a conjugated diene having two double bonds and a maleic anhydride. Which is recyclable.
The method according to claim 1,
Wherein the polyol is 10 to 70% by weight, and the diol and the dicarbonic acid are 30 to 90% by weight.


delete delete delete delete

Images